| Dibeste AS | Professional & scientific | 2026 |
| Dickens Pub AS | Hospitality | 2014 |
| Diepharmex SA | Manufacturing | 2007 |
| Dieseth Drift AS | Administrative & support | 2024 |
| Dieseth Eiendom AS | Real estate | 2023 |
| Diffusion Group Nuf | Administrative & support | 2020 |
| Digis AS | Information & communication | 2016 |
| Digital Expert Alliance AS | Information & communication | 2025 |
| Digital Intelligence Da | Information & communication | 1999 |
| Digital Projects Consulting AS | Information & communication | 2005 |
| Digital Struktur AS | Information & communication | 2026 |
| Digital Suksess AS | Information & communication | 2023 |
| Digital Video Produksjon AS | Information & communication | 1994 |
| Digitech Consulting AS | Information & communication | 2018 |
| Dilative Invest AS | Professional & scientific | 2018 |
| Dilative Management AS | Professional & scientific | 2019 |
| Din Bilforretning AS | | 2026 |
| Din Budbil Da | Transport & logistics | 1994 |
| Din Kjøreskole AS | Education | 1988 |
| Din Maskin AS | Wholesale & retail | 1991 |
| Din Revisor AS | Professional & scientific | 2005 |
| Din Sikkerhet Norge AS | Wholesale & retail | 2019 |
| Din Tømrer AS | Construction | 2023 |
| Dinehome Norge AS | Wholesale & retail | 2019 |
| Diplodocus Utvikling AS | Real estate | 2022 |
| Directmarketing Invest AS | Professional & scientific | 2005 |
| Direkte-Premier AS | Wholesale & retail | 1993 |
| Discobandet Ans | Arts & recreation | 2019 |
| Displayforum AS | Professional & scientific | 2018 |
| Disrupting IT AS | Information & communication | 2019 |
| Ditark AS | Professional & scientific | 2018 |
| Dito Agency AS | Wholesale & retail | 2016 |
| Ditt Motto AS | Education | 2023 |
| Django Invest AS | Professional & scientific | 2020 |
| Djupsjøen Invest AS | Real estate | 2006 |
| Dkwm Invest AS | | 2024 |
| DM Takeaway Konnerud AS | Hospitality | 2011 |
| DMC Holding AS | Professional & scientific | 2005 |
| DMC Regnskap AS | Professional & scientific | 1997 |
| Dmha Holding AS | | 2023 |
| DN Nail AS | Other services | 2024 |
| Dna Ventilation AS | Construction | 2024 |
| Dnspuls AS | Professional & scientific | 2019 |
| Dntprotec Bilskadesikkerhet AS | Other services | 2024 |
| Do IT Now AS | Manufacturing | 2020 |
| Doba Invest AS | Real estate | 2018 |
| Dogteam AS | Wholesale & retail | 2026 |
| Domini AS | Real estate | 2023 |
| Domino Invest AS | | 2021 |
| Domino Norway Nuf | Wholesale & retail | 2006 |
| Donkeyboy Music Group AS | Information & communication | 2015 |
| Donna Holding AS | Real estate | 2016 |
| Dont Holding AS | | 2023 |
| Doppelganger Da | Information & communication | 2013 |
| Dora Holding AS | | 2022 |
| Dormakaba Norge AS | Wholesale & retail | 1980 |
| Dovrekvartalet Næring AS | Real estate | 2024 |
| Dovy AS | Information & communication | 2022 |
| Dovydas Invest AS | Information & communication | 2022 |
| Dpark AS | Transport & logistics | 2016 |
| Dpend Construction AS | Construction | 2008 |
| Dpend Eiendom AS | Real estate | 1996 |
| Dpend Entreprenør AS | Construction | 2011 |
| Dpend Gruppen AS | Construction | 2005 |
| Dpend Invest AS | Real estate | 2021 |
| Dpend Management AS | Construction | 2024 |
| Dpend Næringsbygg AS | Real estate | 2024 |
| Dpend VVS AS | Construction | 2005 |
| DPP Aksess AS | Wholesale & retail | 2021 |
| DR Alghazali AS | Health & social care | 2021 |
| DR Shuja Ur Rehman AS | Health & social care | 2017 |
| DR. Willumsens Kvinneklinikk AS | Health & social care | 2005 |
| Drafn Holding AS | Transport & logistics | 1998 |
| Drafnkollen Fus Barnehage AS | Education | 2019 |
| Dragon Seafood AS | | 2021 |
| Draka Holding NV | Wholesale & retail | 2002 |
| Drammen & Lier Solskjerming AS | Wholesale & retail | 2025 |
| Drammen Arts Festival Da | Administrative & support | 2022 |
| Drammen Barbershop AS | Other services | 2026 |
| Drammen Bardrift AS | Hospitality | 2014 |
| Drammen Begravelsesbyrå AS | Other services | 2020 |
| Drammen Betongsaging AS | Construction | 2024 |
| Drammen Bilco AS | Wholesale & retail | 2024 |
| Drammen Bilpartner Ans | Administrative & support | 1994 |
| Drammen Bilskade AS | Other services | 2015 |
| Drammen Bolig AS | Real estate | 1972 |
| Drammen Boligbyggelags Eiendomsselskap AS | Real estate | 1996 |
| Drammen Brannsikring AS | Construction | 2025 |
| Drammen Bruktbil AS | Wholesale & retail | 2021 |
| Drammen Bye AS | Wholesale & retail | 2023 |
| Drammen Bygg Og Rehabilitering AS | Construction | 2024 |
| Drammen Byggentreprenør AS | Construction | 2002 |
| Drammen Byggkonsult AS | Professional & scientific | 2022 |
| Drammen Byggservice AS | Construction | 2012 |
| Drammen Båt AS | Wholesale & retail | 2024 |
| Drammen Camping AS | Hospitality | 2022 |
| Drammen Cryoklinikk Da | Other services | 2016 |
| Drammen Cryoklinikk Og La Femme Salon AS | Other services | 2025 |
| Drammen Dagligvare AS | Wholesale & retail | 2010 |
| Drammen Dykkersenter AS | Wholesale & retail | 2021 |